Implement changes in deployment specification under devfile registry helm chart

[michael-valdron]

Which area/kind this issue is related to?

/area registry

Issue Description

To create consistancy with the registry operator within the helm chart, the following changes need to be done:

• Outdated probe time values need to be updated

Index Server - startupProbe

Timeouts on the helm chart should be updated to the timeouts on the registry operator:

initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 20

Registry Viewer - livenessProbe

Timeouts on the helm chart should be updated to the timeouts on the registry operator:

initialDelaySeconds: 15
periodSeconds: 10
timeoutSeconds: 20

Registry Viewer - readinessProbe

Timeouts on the helm chart should be updated to the timeouts on the registry operator:

initialDelaySeconds: 15
periodSeconds: 10
timeoutSeconds: 20

• Pod level security context found in the registry operator should be defined in the helm chart as well
• The registry viewer .env should be removed as the environment variables are already being set under the specification: https://github.com/devfile/registry-support/blob/f66264f22310c3c93bf0c77db5f4cd4b560aba5e/deploy/chart/devfile-registry/templates/deployment.yaml#L138

Parent Epic: #1274

Acceptance Criteria

• Set probe time values under helm chart to match same probes under registry operator
• Define pod level security context under helm chart to match registry operator
• Remove .env mount from the helm chart
• Check deployment integrity of changes